Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Preparing single metal
Reexamination Certificate
2005-03-22
2005-03-22
Valentine, Donald R. (Department: 1742)
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Preparing single metal
C205S770000, C205S772000, C204S237000, C204S252000, C204S263000
Reexamination Certificate
active
06869519
ABSTRACT:
An electrolytic process for the production of metallic copper in an electrolytic cell including anode and cathode chambers separated from each other by a porous member, an anode disposed in the anode chamber, and a cathode disposed in the cathode chamber. The process comprises providing an ammoniacal alkaline electrolyte solution containing diammine cuprous ions in each of the anode and cathode chambers, and applying direct current to the anode and cathode to produce metallic copper on the cathode and to produce tetrammine cupric ions on the anode. An electrolytic cell apparatus including anode and cathode chambers separated from each other by a porous member, an anode disposed in the anode chamber, a cathode disposed in the cathode chamber, and a DC current source connected to the anode and cathode, wherein each of the anode and cathode chambers contains an ammoniacal alkaline electrolyte solution containing diammine cuprous ions.
REFERENCES:
patent: 4280887 (1981-07-01), Konstantouros
patent: 4545877 (1985-10-01), Hillis
patent: 6294071 (2001-09-01), Miller et al.
Kazuya Koyama, “Leaching of Copper from Waste Printed Wiring Boards”, Aug. 31, 2001, 34th Autumn Meeting of the Society of Chemical Engineers, Japan.
Lorusso, Loud & Kelly
National Institute of Advanced Industrial Science and Technology
Valentine Donald R.
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